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Your search keyword '"Zhang, Yinchao"' showing total 15 results
Start Over Author "Zhang, Yinchao" Journal applied optics
15 results on '"Zhang, Yinchao"'

6. Determination of the refractive index and size distribution of aerosol from dual-scattering-angle optical particle counter measurements

Author

Hu, Huanling, Li, Xuebin, Zhang, Yinchao, and Li, Tao

Subjects
Aerosols -- Distribution, Refractive index -- Analysis, Refractive index -- Methods, Company distribution practices, Astronomy, Physics
Abstract

A method is presented for inferring both the refractive index and the size distribution of aerosol from observations of a dual-scattering-angle optical particle counter (OPC). An existing prototype of an OPC with 60[degrees] and 90[degrees] dual-scattering angles was used for the experiments. Based on the high sensitivity of the OPC response to the refractive index of particulates, two families of size distribution curves may be calculated. The solution of the refractive index corresponds to the superposition of the two size distributions. This method was applied to the simulation and to the field measurements conducted in Beijing and Hefei, and the results of both are presented. OCIS codes: 290.3030, 290.5850, 120.0120.

Published
2006

15. Optical design of a reflective double-grating spectrometer to detect one branch in the pure rotational Raman spectrum of N 2 .

Author

Wang L, Chen H, Zhang Y, Chen S, Guo P, Tan W, Jiang Y, and Li X

Abstract

This paper presents the optical design of a high-resolution double-grating spectrometer for extracting the multiple lines in the Stokes or anti-Stokes branch of the pure rotational Raman spectra of nitrogen. The spectrometer is composed of collimating and focusing mirrors, two reflective gratings, and a linear detector. The structural parameters were calculated using geometric configuration, dispersion, and aberrational theory, and conditions for first-order correction of keystone distortion with divergent grating illumination were derived. Based on this method, we simulated a spectrometer with a 16-channel linear array photomultiplier tube, resulting in uniformly distributed single-branch lines on each detector channel. The resolution reached 0.225 nm per channel, and the keystone distortion was less than 0.7%. The spectrometer avoids the interference of elastic signals by not detecting them, enabling the extraction of atmospheric temperature profiles via separated single-branch lines with high precision. Our design provides a promising solution to extract atmospheric temperature profiles for pure rotational Raman lidar.

Published
2023
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